diff --git a/pkgs/development/tools/rars/default.nix b/pkgs/development/tools/rars/default.nix
new file mode 100644
index 000000000000..47de7887b9ec
--- /dev/null
+++ b/pkgs/development/tools/rars/default.nix
@@ -0,0 +1,33 @@
+{ lib, fetchurl, stdenvNoCC, makeWrapper, jre }:
+
+stdenvNoCC.mkDerivation rec {
+  pname = "rars";
+  version = "1.5";
+
+  src = fetchurl {
+    url = "https://github.com/TheThirdOne/rars/releases/download/v${version}/rars1_5.jar";
+    sha256 = "sha256-w75gfARfR46Up6qng1GYL0u8ENfpD3xHhl/yp9lEcUE=";
+  };
+
+  dontUnpack = true;
+
+  nativeBuildInputs = [ makeWrapper ];
+
+  installPhase = ''
+    runHook preInstall
+    export JAR=$out/share/java/${pname}/${pname}.jar
+    install -D $src $JAR
+    makeWrapper ${jre}/bin/java $out/bin/${pname} \
+      --add-flags "-jar $JAR"
+    runHook postInstall
+  '';
+
+  meta = with lib; {
+    description = "RISC-V Assembler and Runtime Simulator";
+    homepage = "https://github.com/TheThirdOne/rars";
+    sourceProvenance = with sourceTypes; [ binaryBytecode ];
+    license = licenses.mit;
+    maintainers = with maintainers; [ athas ];
+    platforms = platforms.all;
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 0ba0c1feb777..0a256764fb26 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -35560,6 +35560,8 @@ with pkgs;
     inherit (darwin.apple_sdk.frameworks) Security;
   };
 
+  rars = callPackage ../development/tools/rars { };
+
   rargs = callPackage ../tools/misc/rargs { };
 
   rancher = callPackage ../applications/networking/cluster/rancher { };